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ORDER NO. §D8012-1811
ervice Manual FM/AM Stereo Receiver
SA-222
[M], [MC]
Areas
* [M] is available in U.S.A.
* [MC] is available in Canada.
TECHNICAL SPECIFICATIONS _ Specifications are subject to change without notice for further improvement.
I } Subsonic filter 30 Hz, --6 dB/oct.
( He 78) Loudness control (volume at --30 dB) 50 Hz, +9 dB
@ AMPLIFIER SECTION Low frequency damping factor 30 (8 ohms)
15 (4 ohms)
eat < Load impedance
Rated minimum sine wave RMS power output MAIN or REMOTE 4246 Shine
20 Hz~20 kHz both channels driven MAIN and REMOTE 8~16 ohms
0.04% total harmonic distortion
30W per channel (8 ohms) @ FM TUNER SECTION
1 kHz continuous power output
both channels driven Frequency range 87.9~ 107.9 MHz
0.04% total harmonic distortion Sensitivity 10.8 dBf (1.9 uV, IHF '58)
33W per channel (8 ohms) 50 dB quieting sensitivity
35W per channel (4 ohms) MONO 13.7 dBf (2.7 uV IHF '58)
Dynamic headroom 0.7 dB (8 ohms) STEREO 37.2 dBf (39.7 uV IHF '58)
Total harmonic distortion Total harmonic distortion
rated power at 20 Hz~20 kHz 0.04% (8 ohms) 100 Hz 0.15% (MONO), 0.2% (STEREO)
half power at 20 Hz~20 kHz 0.025% (8 ohms) 1 kHz 0.15% (MONO), 0.2% (STEREO)
half power at 1 kHz 0.009% (8 ohms) 6 kHz 0.3% (MONO), 0.3% (STEREO)
SMPTE intermodulation distortion 0.04% (8 ohms) S/N
PHONO RIAA standard curve +0.8 dB MONO 75 dB
TUNER, AUX, TAPE 5 Hz~70 kHz, --3 dB STEREO 70 dB
20 Hz~20 kHz, +0.2 dB, --0.2 dB Frequency response 20 Hz~15 kHz, +1 dB --2 dB
Input sensitivity Alternate channel selectivity 70 dB
PHONO 0.5 mV (2.5 mV, IHF '66) Capture ratio 4.2dB
TAPE 30 mV (150 mV, IHF '66) image rejection at 98 MHz 55 dB
S/N (IHF, A) IF rejection at 98 MHz 75 dB
PHONO 75 dB (80 dB, IHF '66) Spurious response rejection at 98 MHz 82 dB
TUNER, AUX, TAPE 80 dB (95 dB, IHF '66) AM suppression 55 dB
Maximum input voltage Stereo separation
PHONO 120 mV (130 mV, 1 kHz) 1 kHz 42 dB
Input impedance 10 kHz 32 dB
PHONO 47 kilohms Carrier leak
TAPE 22 kilohms 19 kHz ~38 dB
Tone controls 38 kHz ~60 dB
BASS 50 Hz, +10 dB~ -10 dB Antenna terminals 300 ohms (balamced)
TREBLE 20 kHz, +10 dB~ -10 dB 75 ohms (unbaamced)
Panasonic Company Panasonic Hawaii, Inc. Panasonic Canada
Ti nh = Division of Matsushita Electric 320 Waiakamilo Road, Honolulu, Division of Matsushita Electric,
ec nics Corporation of America Hawaii 96817 of Canada Ltd.
One Panasonic Way, Secaucus, 5770 Ambler Drive,
New Jersey 07094 Mississauga, Ontario L4W 2T3
@ AM TUNER SECTION Dimensions (WxHxD) 430 x 120 x 300 mm
(16-15/16" x 4-23/32" x 11-13/16")
Frequency range 530~ 1620 kHz Weight 5.9 kg
Sensitivity 30 wV, 300 uwV/m (13 tb.)
Selectivity 55 dB
Image rejection at 1000 kHz 50 dB Note:
IF rejection at 1000 kHz 40 dB This unit is equipped with an FM/AM allocation selector on
the rear panel. The specifications shown above are correct
@ GENERAL with this selector set to the "FM 0.2 MHz/AM 10 kHz" position.
If it is set to the "FM 0.05 MHz/AM 9 kHz" position, however, the
Power consumption 185W FM frequency range becomes 87.50~108.00 MHz, and the AM
Power supply AC 120V, 60 Hz frequency becomes 522~1611 kHz.
Weights and dimensions shown are approximate.
m@ CONTENTS
Page Page
LOCATION OF CONTROLS........2... 2.0 ee eee 2,3 PRINTED CIRCUIT BOARD
DISASSEMBLY INSTRUCTIONS ..............-.. 3~6 Tuner circuit & Equalizer circuit. ............5- 13, 14
ADJUSTING INSTRUCTIONS. ............-0.000. 6,7 FM/AM preset tuning circuit ...........0. 15, 16
000%
ADJUSTING POINTS .. 0.0... pee ee ee et ns 8 Main amplifier circuit... ........0000
ec cence 17,18
BLOCK DIAGRAM. ........ 0.00. ee eee eee eee 9,10 SCHEMATIC DIAGRAM ...........2-0220 19 ~ 23 00
REPLACEMENT PARTS LIST (Electric Parts)....... 11, 12, 24 EXPLODED VIEWS ..... 2... . ce ee ee eee 25 ~ 27
REPLACEMENT PARTS LIST (Cabinet & Chassis Parts)... . 28
.
m LOCATION OF CONTROLS
Quartz-lock indicator Memory
gE FM stereo indicator
(up) Digital frequency meter
Tuning--{
down) Memory indicator
Signal-Strength indicators
Analog frequency meter-- (aux)
Band (AM) funert-tnoe selectors
selectos tse (phono)
Volume control
Headphones jack
(tape 2) Tape-monitor
(tape 1 Paslactore
Speaker al
selectors (remote) Loudness (goff, =on)
(bass) Balance control
Tone controls ar ble)
re --Preset-tuning
Automatic-scan Subsonic filter (m off, = on)
( Lon, = off manual)
FM muting/FM mode
( mon/FM auto, = off/FM mono)
FM/AM allocation selector AM antenna
FM 0.05MHz STEP
| 0.2MHz terminal Outlets (unswitched)
AM = 9kHz 10kHz STEP AM ferrite-bar antenna
ep m - ee vain
speaker terminals
Oe qe g é = Remote
FM antenna aw
inals
termina 75Q. -- - speaker terminals
Ground Battery
Phono input (Playback) (Memory reserve)
Aux input Tape 1
(Rec out) (Rec out)
Tape 24
(Playback)
Power
transformer
Tuner circuit
P.C.B.
Main amplifier pk
circuitP.C.B. La
Equalizer
circuit P.C.B.
Analog
frequency
meter
ao
fz} Stereo eye driver circuit P.C.B.
m@ DISASSEMBLY INSTRUCTIONS
e How to remove the cabinet
1. Remove the 8 setscrews (Fig. 1: @~@®) on
the side and 3 setscrews (Fig. 1: @~ @) on
the back of the cabinet.
2. Remove the cabinet.
(Fig. 1]
e How to remove the bottom board
1. Remove the 8 setscrews (Fig. 2: @~ @) of the f° Tr 7
bottom board. @
2. Remove the bottom board.
[Fig. 2]
Stereo eye '®
driver P.C.B.
je Stereo eye FM/AM preset tuning
Front panel circuit P.C.B.
driver P.C.B.
Lead
connector
[Fig. 3]
Front panel
e How to remove the FM/AM preset tuning printed
circuit board and the analog frequency meter
1. Remove the cabinet.
2. Remove the 6 setscrews (Fig. 2 and 3: @ ~ @) of the [Fig. 4]
front panel.
3. Move the front panel in the direction of the arrow @ in Front chassis
Fig. 3.
4. Open the `ead holder'' of the lead conector and pull
out the lead wire of the arrow @) in Fig. 3.
5. Remove the 2 lock pins (Fig. 3 : @ , @) to detach the
stereo eye driver printed circuit board.
6. Remove the 3 setscrews (Fig. 4 : @ ~ @)) to detach the
FM/AM preset tuning printed circuit board.
7. Remove the 2 setscrews (Fig. 5 : @) , @) to detach the
analog frequency meter in direction of the arrow@, and
2 lugs (Reflector bracket of left and right side) to detach
Analog frequency
the reflector bracket from the analog frequency meter in
meter
direction of the arrow ®.
Reflector Pilot lamp
bracket
[4] [Fig. 5]
e@ How to remove the power !IC @ Rear panel Heat sink
1. Remove the cabinet and bottom board. (Refer to os
`How to remove the cabinet,'' and ``How to remove @ Power IC
the bottom board."') SS ee a
2. Remove the 4 setscrews (Fig. 6 : @ ~ @) to detach
the power transformer from rear panel in the direc-
tion of the arrow @.
w Unsolder power IC.
of
4. Remove the 2 setscrews (Fig. 6 : @ , @) used to
secure the power IC on the heat sink, and then pull
the power IC.
5. When mounting the power IC, apply silicone com-
pound (or equivalent heat diffuser) to the rear side of
power IC, and then follow the steps 1 ~ 4 reversely.
Power transformer
[Fig. 6]
e How to replace chips (resistor, capacitor and jumper)
1. Unsolder from chip by using solder sucker.
2. Remove chip with tweezers by rotating it while remov-
ing solder as shown in Fig. 7.
3. Solder circuit board first and then solder chip in the
Tweezers
direction of the arrow as shown in Fig. 8.
Notes:
1. Do not use chip again which is removed from printed
_ Soldering
circuit board.
2. Use lead wire with insulator for replacement instead of pee
chip jumper. z
Color Original Parts Name
Unsolder
Black Chip Resistor and Jumper
Brown, White or Green Chip Capacitor
e Note for replacing chips
1. Do not heat chips more than three (3) seconds.
2. Be careful not to damage the electrode of chips.
3. Use soldering iron (less than 60W) and tweevers for
replacing chips.
e Precautions for repair
Soldering
Chip When frequency is not indicated, FL (display tuse), FL
iron
driver, digit circuit, and micro-computer must be ch ecked
by oscilloscope.
Solder In this case, take care not to allow short circuit between IC
terminals or application of voltage from measuring j nstru-
ment to IC terminals.
* Since standardized parts are mentioned in the parts list, they are sometimes different in Part No. and Color from
the product parts.
Type Color Product Part No. Figure No.
ft
4x 8mm, Tapping Silver XTB4+8FFN
3x 10mm, Tapping Black XTB3+10BFZ
3x 12mm, Tapping (With plain washer) Red XTW3+12HFYR
3x 8mm, Tapping Black XTB3+8BFZ
3x 10mm, Tapping Gold XTB3+10B
3 x 10 mm, Tapping (With plain washer) Gold XTW3+10H
4x 10mm, (With spring washer & plain washer) Black XYA4+FF 10FZ
@1®
B|
GB)
BD)
O|
OB) 3 x 16 mm, Tapping (With plain washer) Gold XTW3+16H
m@ ADJUSTING INSTRUCTIONS
Note: AM OSC Coil (L202) and AM 2nd IFT (T202) have been already adjusted, and require no adjustment.
[AM TUNER ADJUSTMENT |
Setting and Equipment used
. ACand DC electronic voltmeters (VT VM) Use a non-metal screwdriver for the adjustment.
. AM signal generator (AM-SG) Set FM-AM muting/mode switch to ``on/FM auto" position.
. Maintain line voltage at 120 volts. Set band selector to ``AM"' position.
. Output of signal generator should be no higher than Set tape monitor switch to `source' position.
necessary to obtain an output reading. Set speaker selector to ``main" position.
. Pull the AM ferrite-bar antenna (L201) outward. Set automatic-scan switch to "off"' position.
. Set input selector to `tuner' position. Set FM/AM allocation selector to "`0.2MHz/10kHz"' position.
AM SIGNAL GENERATOR DISPLAY PARTS
PREPARATIONS ADJUSTED ADJUSTING PROCEDURE
FREQUENCY
CONNECTION FREQUENCY
AM-IF ADJUSTMENT
Connect AM-SG to AM
antenna terminal 450kHz Frequency of Connect AC VTVM . Adjust the input frequency
through 220pF (30% mod. non-inter- or scope to "`Speaker"' T201 (1st IFT) and adjustment points so
capacitor. Common to with 400Hz) ference terminals of the set. that the output becomes
chassis. (Powerful input) maximum.
a
pene
ANALOG FREQUENCY METER ADJUSTMENT `* Set b and selector to ``FM" position.
1. Adjust L4 so that voltage
Connect DC VTVM
No-Signal 90.1MHz
to ay terminal.
L4 (FM OSC Coil) measured by DC voltmeter is
4.49 + 0,05V.
. Adjust CT1 so that voltage
Connect DC VTVM CT1 (FM OSC
No-Signal measured by DC voltmeter is
SOG Mie to terminal. Trimmer)
10.71 + 0.05V.
. Adjust VR102 so that the
VR102
No-Signal 100.1MHz frequency meter indicates
(Frequency meter)
100.1MHz. (Refer to Fig. 13)
. Adjust VR102 so that the
No-Signal 107.9MHz VR102 frequency meter indicates
(Frequency meter) 107.9MHz. (Refer to Fig. 12)
2. Repeat steps (4) and (5).
AM-RF ADJUSTMENT `* Set band selector to "AM" position.
. Adjust CT202 so that the
Connect DC VTVM CT202
No-Signal 1100kHz to Mi) terminal. frequency meter indicates
(AM OSC Trimmer)
1100kHz. (Refer to Fig. 12)
. If it is not adjustable, set the
frequency to 530kHz and
adjust L202 (AM OSC Coil)
so that the voltage of TP1 is
1.2+ 0.05V.
. Next, set the frequency to
1500kHz and make sure that
the range is within @ of
Fig. 13.
If it is not within the range,
perform the adjustments of
steps 1 and 3 again.
OC VTVM
AM SIGNAL GENERATOR DISPLAY PARTS
PREPARATIONS ADJUSTING PROCEDURE
FREQUENCY ADJUSTED
CONNECTION FREQUENCY
1___
AM-RF ADJUSTMENT
COIL (1\OOpH)
610kHz Connect AC VTVM . Adjust for maximum output. (SLOXI0I - 20)
Connect AM-SG to
(30% Mod. 610kHz to scope to ``Speaker"' L201 (ANT Coil) . Adjust ferrite core of L201 by To SG | 112.50 |
with 400Hz) terminals of the set. screwdriver. fe} 1To Receiver
AM antenna terminal (SG imp.
752) 1600 |
through 200pF Connect AC VTVM . Adjust for maximum output.
1500kHz CT201
capacitor. Common to 1500kHz . Repeat step (7) until the
(30% Mod. to scope to ``Speaker"'
chassis. (Weak input) (ANT Trimmer)
with 400Hz) terminals of the set. frequency correctly matches
Noise
the dial display.
3002 FM Dummy Antenna
AF output wave form
FM TUNER ADJUSTMENT
[Fig. 9] [Fig. 10] (Fig. 11]
Equipment used * Preparation of FM signal generator (FM-SG)
FM signal generator (FM-SG) 1. Connect stereo modulator to FM-SG. Pointer
. Stereo modulator 2. Apply SG output to antenna terminal of the set through 3000
. Distortion analyser FM dummy antenna.
. Oscilloscope 3. The standard input of the set is 60dB (1mV), 400Hz 100%
. ACand DC electronic voltmeters (VTVM). modulation (Because of using dummy antenna, SG output
. Frequency counter (19kHz and 108MHz measurable). must be 12dB plus (IHF). That is, when input is 60dB, SG
FM300Q dummy antenna (Fig. 9) . output is to be 72dB.
Setting
. Setband selector to ``FM"' position.
. Other setting are the same as in AM tuner adjustment.
(When 1100kHz) (When 107.9MHz) (When 100.1MHz) (When 1500kHz)
AM SIGNAL GENERATOR |
[Fig. 12] [Fig. 13]
DISPLAY PARTS
PREPARATIONS ADJUSTING PROCEDURE
FREQUENCY ADJUSTMENT
CONNECTION FREQUENCY |
Step
FM-IF ADJUSTMENT
No.
Connect DC VTVM Adjust T101 core so that voltage
ADJUSTING POINTS
between [§GEIOA and measured in signal mode is OV in AM Antenna AM OSC AM Antenna
No-Signal 100. 1MHz T101 (Discri. IFT)
through choke 300mV range. coil trimmer trimmer
coil. (Refer to Fig. 10)
[L201 |
201
FM RF ADJUSTMENT AM OSC
ea . Check step (2) and if it is Pull out
deflected readjust of L4. FM Antenna
. Add weak input so that noise coil
is included in the output wave
Connect FM-SG to 90.1MHz L1 (FM ANT Coil) form.
Connect scope to
FM antenna terminal (100% Mod. "Speaker'' terminals L2 (FM DET Coil) . Make the adjustment so that
90.1MHz
through 3000 FM with 400Hz) the output wave form is AM-IF (Ist)
of the set. T1 (FM IFT)
dummy antenna. Weak input vertically symmetrical. FM Detector
(Refer to Fig. 11) coil
. Check step (3) and if it is
deflected readjust of CT1.
FM MUTING LEVEL ADJUSTMENT
re . Set the FM muting/FM mode
MPX VCO adj.
Connect FM-SG to switch to "`off/mono".
FM antenna terminal Connect AC VTVM . With the FM muting/FM
100. 1MHz
through 3000, FM 100.1MHz VR101(Muting level) mode switch set to "`on/auto"
10 (100% Mod. or scope to `'Speaker"'
dummy antenna. terminals of the set. adjust VR101 so that the
with 400Hz) AM-IF (2nd)
(Apply 16dB to output is given with muting
antenna terminal) condition released. T202
FM MPX PILOT (VCO) ADJUSTMENT
Connect FM-SG to Connect frequency . Set the FM muting/FM mode
FM antenna terminal 100. 1MHz counter to Mggeyeh} switch to ``on/auto".
through 300Q FM (Non- 100.1MHz VR301 (VCO)
11
dummy antenna. modulated)
terminal through
resistor (100kQ)
. Adjust VR301 to
19kHz + 30Hz.
FM OSC
trimmer
STEREO DISTORTION ADJUSTMENT
Frequency meter |
12
Connect FM-SG to
FM antenna terminal
through 3000 FM
dummy antenna.
100.1MHz
(100% Mod.
with 400Hz)
100.1MHz
Connect distortion
analyser to ``Speaker"' T1 (IFT)
. Set the FM muting/FM mode
.
switch to ``on/auto"'.
Re-adjust the already adjusted
T1 within + 90° from the
preset core position so that
`re
terminals of the set. the distortion of L ch is
(Pilot 10% Mod. (L mode)
stereo signal) minimized.
FRONT
m BLOCK DIAGRAM
IC 102
a (SVILAI231NS)
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3 Ic301 (SVIpPCII6IC)
£36 .
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TI CF IOI : ae
5
Q304
x De-
Z
: 16 4 14 16 Q305
Q108,109 4 is 14 ic905 (AN6876)
Signal indicator on/FM auto
Q107
iG Ooftts
FM mono
| ont Mauto
| O
Frequency meter
°
off/FM mono
Battery Sié
ae az
(FM muting/mode)
ie IFT +
Q101~ 103
@® 5 ; | vRio2 Q202 Q203 |msnng|
S15 (Auto scan)
4 Quartz lock indicator
Q908 Q906
FM/AM Stereo 8)
allocation Buffer +5V eye driver To power IC
selector QI06
- Q106 Rectifier
Power
> é FM/AM 4 4 To equalizer amp. transformer
Control Q706 ~708
Stereo memor:
KEY-BOARD ImNI71 : To tuner circuit
Preset
Tuning FM "Hi
LIL!
IC601 To fluorescent display circuit
Memory
FM/AM
@ @ (AN7060)
FM circuit AM circuit
selection
_O e) __s
$406 (Loudness)
IC603 Power amp. S601 (Main speaker)
$402
0 on $404,405
on
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Ic4or (Tuner) (Tape monitor) e O